package servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import dao.UserDao;

/**
 * Servlet implementation class LoginServlett
 */
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
//		response.getWriter().append("Served at: ").append(request.getContextPath());
        this.doPost(request, response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        String uName = request.getParameter("uName");
        String uPassword = request.getParameter("uPassword");
        UserDao udao = new UserDao();

        if(uName != null && uPassword != null) {
            String qr = udao.queryByName(uName);
//			System.out.println(qr);
            if(qr == null) {
                request.setAttribute("nameErrorMess", "用户名不存在，请重新输入！");
            }else if(!qr.equals(uPassword)) {
                request.setAttribute("passwordErrorMess", "密码错误，请重新输入！");
            }else {
                request.getSession().setAttribute("uName", uName);
                response.sendRedirect("MessageServlet");
                return;
            }
        }

        request.getRequestDispatcher("index.jsp").forward(request, response);

    }

}
